[134] for, having taken it, he began to divide it thus: in the first instance, he made two divisions, the heavy and the light, separating that which was thick from that which was more subtle. After that, he again made a second division of each, dividing the subtle part into air and fire, and the denser portion into water and earth; and, first of all, he laid down those elements, which are perceptible by the outward senses, to be, as it were, the foundations of the world which is perceptible by the outward senses.